Liquid tight fitting for conduit

1. A connecting device for providing a liquid tight connection between a support having an aperture and a non-metallic conduit, said connecting device comprising:

a tubular body with an integral central flange having a forward face and a rearward face, a rear tubular section extending axially from said rearward face, a tubular nose section extending axially from said forward face, and an annular cover section, an annular passageway being formed between said rear tubular section and said cover section, at least one thread being formed in said cover section, projecting radially inwardly into said passageway, and extending circumferentially along a spiral path, at least one aperture being formed in said cover section and extending between said at least one thread and the rearward face of said central flange;

a sealing ring adapted for mounting in said passageway externally of said rear tubular section and adjacent said rearward face, said sealing ring being capable of sealing a joint formed between said tubular body and an end of said conduit during use of said connecting device; and

a forward fastening device for securing said tubular nose section to a support member.

2. A connecting device according to claim 1 wherein said mar tubular section is longer than and coaxial with said cover section.

3. A connecting device according to claim 1 wherein said nose section is externally threaded and said forward fastening device is a lock nut that can be threaded onto said nose section.

4. A connecting device according to claim 3 wherein said sealing ring is made of elastomeric material and is mounted in said passageway adjacent said rearward face.

5. A connecting device according to claim 1 wherein the width of said passageway between said rear tubular section and said cover section is approximately equal to the thickness of an annular wall forming the conduit.

6. A connecting device for providing a liquid tight connection between a support having an aperture and a non-metallic conduit, said connecting device comprising:

a tubular body with an integral central flange having a forward face and a rearward face, a rear tubular section extending axially from said rearward face, a tubular nose section extending axially from said forward face, and an annular cover section, an annular passageway being formed between said rear tubular section and said cover section, two threads being formed in said cover section and on opposite sides of said cover section and projecting radially inwardly into said passageway, each of said threads extending circumferentially along a spiral path through an acute angle of no more than 90°;

a sealing ring adapted for mounting in said passageway externally of said rear tubular section and adjacent said rearward face, said sealing ring being capable of sealing a joint formed between said tubular body and an end of said conduit during use of said connecting device; and

a forward fastening device for securing said tubular nose section to a support member.

7. A connecting device according to claim 4 wherein said central flange is multi-sided to allow said tubular body to be turned about its longitudinal axis by means of a suitable tool.

8. A connecting device according to claim 2 wherein said cover section has an annular rear end and an internal chamfer is formed on said rear end.

9. A connecting device according to claim 1 wherein said tubular body is an integral one-piece body molded from rigid, plastics material.

10. A connecting device for providing a liquid tight connection between a support having an aperture and a non-metallic conduit, said connecting device comprising:

a tubular body having front and rear tubular sections and an annular cover section extending over at least a portion of the rear tubular section, an annular passageway being formed between the rear tubular section and said cover section and adapted to receive an end section of said conduit, two thread sections being formed on opposite sides of said cover section and projecting radially inwardly into said passageway, each thread section extending circumferentially along a spiral path through an arc of about 45° or less, said tubular body being molded as an integral one-piece body made of rigid, plastics material;

a sealing ring adapted for mounting in said passageway adjacent an inner front end thereof, said ring being capable of sealing a joint formed between said tubular body and an end of said conduit during use of said connecting device; and

a forward fastening device for securing the front tubular section to a support member,

wherein said two thread sections are adapted for self threading of the conduit.

11. A connecting device according to claim 10 wherein said rear tubular section is longer than and coaxial with said cover section.

12. A connecting device according to claim 10 wherein there are two apertures formed in said cover section and each aperture extends axially inwardly from a respective one of the two thread sections.

13. A connecting device for providing a liquid tight connection between a support having an aperture and a non-metallic conduit, said connecting device comprising:

a tubular body having front and rear tubular sections and a tubular outer section extending over at least a portion of the rear tubular section and spaced apart therefrom, said rear tubular section and said outer section being coaxial and forming an annular passageway which is substantially closed at an inner end thereof and open at an outer end thereof and is adapted to receive an end section of said conduit, ridge means being formed on said outer section and projecting radially inwardly into said passageway, said ridge means having two edges arranged for conduit self-threading purposes and comprising two spiral-shaped thread sections located on opposite sides of said outer section, each thread section extending through a spiral-shaped arc subtending an angle of less than 90°;

a separate flat sealing ring made of elastomeric material located in said passageway and adjacent the substantial dosed inner end of said passageway, said sealing ring being capable of sealing a joint between said tubular body and an end of said conduit during use of said connecting device; and

forward fastening means for securing said front tubular section to a panel.

14. A connecting device for connecting a support having an aperture and a non-metallic conduit having an outer diameter, said connecting device comprising:

a tubular, integral one-piece body molded from rigid, plastics material, having an integral central flange with a forward face and a rearward face, a rear tubular section extending axially from said rearward face, a tubular nose section extending axially from said forward face and adapted for Insertion through said aperture, and an annular cover section having an inner diameter slightly lamer than the outer diameter of said conduit, an annular passageway being formed between said rear tubular section and said cover section and having an open outer end adapted to receive an end section of said conduit, two spiral shaped thread sections being formed on opposite sides of said cover section and projecting radially inwardly into said passageway, each thread section having an edge arranged for conduit self-threading purposes and extending circumferentially through an acute angle of no more than 90°, and

a forward fastener for engaging said nose section in order to secure the connecting device to said support.

15. A connecting device according to claim 14 wherein said tubular nose section is externally threaded and said forward fastener is a lock nut that can be threaded onto said nose section.